import 'package:dio/dio.dart';
import 'package:enjoy_plus_community/utils/token.dart';
import 'package:enjoy_plus_community/utils/eventbus.dart';

class Http {
  final _dio = Dio();

  Http() {
    // 配置基础地址
    _dio.options.baseUrl = 'https://live-api.itheima.net';
    // 设置连接超时时间
    _dio.options.connectTimeout = const Duration(seconds: 5);
    // 设置接收超时时间
    _dio.options.receiveTimeout = const Duration(seconds: 5);
    // 设置请求头
    _dio.options.headers = {'Content-Type': 'application/json'};
    // 添加请求和响应拦截器
    _addInterceptors();
  }

  void _addInterceptors() {
    _dio.interceptors.add(
      InterceptorsWrapper(
        onRequest: (options, handler) async {
          // 请求拦截器：添加公共请求参数，如token等
          final token = TokenManager().getToken() ?? '';
          if (token.isNotEmpty) {
            options.headers['Authorization'] = 'Bearer $token';
          }
          return handler.next(options);
        },
        onResponse: (response, handler) {
          // 响应拦截器：统一处理成功响应
          return handler.next(response);
        },
        onError: (DioException error, handler) {
          // 响应拦截器：统一处理错误响应
          return handler.next(error);
        },
      ),
    );
  }

  /// 成功结果的处理
  dynamic _handleResponse(Response response) {
    if (response.statusCode! >= 200 && response.statusCode! < 300) {
      return response.data;
    } else {
      throw Exception('请求失败，状态码：${response.statusCode}');
    }
  }

  /// 错误结果的处理
  dynamic _handleError(error) {
    if (error is DioException) {
      if (error.type == DioExceptionType.connectionTimeout ||
          error.type == DioExceptionType.receiveTimeout) {
        throw Exception('网络连接超时');
      } else if (error.type == DioExceptionType.badResponse) {
        if (error.response?.statusCode == 401) {
          TokenManager().removeToken();
          eventBus.fire(TokenInvalidEvent('token失效'));
        } else {
          throw Exception('响应错误，状态码：${error.response?.statusCode}');
        }
      } else {
        throw Exception('网络请求错误：$error');
      }
    } else {
      throw Exception('未知错误：$error');
    }
  }

  /// 发起 get 请求
  /// 返回解析后的响应数据或错误信息
  Future<dynamic> get(String url, {Map<String, dynamic>? params}) async {
    try {
      final response = await _dio.get(url, queryParameters: params);
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 发起 post 请求
  /// 返回解析后的响应数据或错误信息
  Future<dynamic> post(String url, {dynamic data}) async {
    try {
      final response = await _dio.post(url, data: data);
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 发起 put 请求
  /// 返回解析后的响应数据或错误信息
  Future<dynamic> put(String url, {Map<String, dynamic>? data}) async {
    try {
      final response = await _dio.put(url, data: data);
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 发起 delete 请求
  /// 返回解析后的响应数据或错误信息
  Future<dynamic> delete(String url, {Map<String, dynamic>? data}) async {
    try {
      final response = await _dio.delete(url, data: data);
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }
}

// 导出
final http = Http();
